Final answer:
Alpha-hydroxy acids should not be used on sensitive areas, open wounds, or irritated skin. They can cause irritation due to their exfoliating properties and increase vulnerability to sun damage, necessitating sun protection.
Step-by-step explanation:
Alpha-hydroxy acids (AHAs) should not be used over sensitive areas of the skin, open wounds, or skin that is irritated or compromised. When using products containing AHAs, it is important to avoid any abrasions or areas that may be susceptible to intense irritation due to the exfoliating properties of these acids. Furthermore, appropriate sun protection should be used when applying AHAs, as they can make the skin more prone to sun damage due to the increased turnover of the skin cells.